Earlier quoted context omitted.
If a conference wants to have a policy governing the actions of their attendees whilst at the conference , wonderful. If a conference thinks they have any right to govern the actions of people who happen to be attendees whilst not at the conference , then they can go pound sand. It's sad that this woman was apparently treated so poorly, but there's no possible way for a conference to write a legally-binding code of c…
The policy does not need to be legally binding, just very clear of the consequences, and they can make clear what will happen if they get a complaint about you.
Don't worry, in no way am I going to abuse this information to make baseless complaints against you. All my complaints will be solidly based on malice.